def setup_sensors(self):
sensor = Sensor(int, "sensor1", "Test sensor 1", "count", [0, 10])
sensor.set_value(sensor.value(), status=Sensor.UNKNOWN, timestamp=1)
self.add_sensor(sensor)
sensor2 = Sensor(int, "sensor2", "Test sensor 2", "count", [0, 10])
sensor2.set_value(sensor.value(), status=Sensor.UNKNOWN, timestamp=0)
self.add_sensor(sensor2)
def setup_sensors(self):
sensor = Sensor(int, "sensor1", "Test sensor 1", "count",
[0, 10])
sensor.set_value(sensor.value(), status=Sensor.UNKNOWN, timestamp=1)
self.add_sensor(sensor)
sensor2 = Sensor(int, "sensor2", "Test sensor 2", "count",
[0, 10])
sensor2.set_value(sensor.value(), status=Sensor.UNKNOWN, timestamp=0)
self.add_sensor(sensor2)
class MyServer(DeviceServer):
VERSION_INFO = ("dummy-server", 1, 0)
BUILD_INFO = ("hipsr-dummy-server", 0, 1, "")
def setup_sensors(self):
"""Setup some server sensors."""
self._time_result = Sensor(Sensor.TIMESTAMP, "time.result",
"Last ?time result.", "")
self._read_result = Sensor(Sensor.STRING, "read.result",
"Last ?read result.", "")
self._write_result = Sensor(Sensor.STRING, "write.result",
"Last ?write result.", "")
self.add_sensor(self._time_result)
self.add_sensor(self._read_result)
self.add_sensor(self._write_result)
@request()
@return_reply(Timestamp())
def request_time(self, sock):
"""Return the current time in ms since the Unix Epoch."""
r = time.time()
self._time_result.set_value(r)
return ("ok", r)
@request(Str(),Int(),Int())
@return_reply(Str())
def request_read(self, sock, device_name, bytes, offset=0):
"""Dummy implementation of kactp ?read command
Opens a pickled data file stored in /snap directory,
and returns a packed struct of the data.
Notes
-----
* The pickle should already be packed as a struct.
* Currently ignoring the bytes and offset arguments.
"""
# Attempt to load pickled data
try:
filename='%s/registers/%s.pkl'%(os.getcwd(),device_name)
data = pkl.load(open(filename,'r'))
except:
return ("fail", "Could not load %s."%filename)
# Return data
self._read_result.set_value(data)
return ("ok", data)
@request(Str(),Int(),Str())
@return_reply(Str())
def request_write(self, sock, device_name, offset, data):
"""Dummy implementation of kactp ?write command
Opens a pickled data file stored in /register directory,
and writes a value to it.
Notes
-----
* katcp_wrapper passes us already serialzed data, so no need to use struct
"""
# Attempt to dump pickled data
try:
filename='%s/registers/%s.pkl'%(os.getcwd(),device_name)
pkl.dump(data, open(filename,'w'))
except:
return ("fail", "Could not dump %s."%filename)
return ("ok", data)
class FakeSensor(object):
"""Fake sensor."""
def __init__(self,
name,
sensor_type,
description,
units='',
params=None,
clock=time):
self.name = name
sensor_type = Sensor.parse_type(sensor_type)
params = str(params).split(' ') if params else None
self._sensor = Sensor(sensor_type, name, description, units, params)
self.__doc__ = self.description = description
self._clock = clock
self._listeners = set()
self._last_update = SensorUpdate(0.0, 0.0, 'unknown', None)
self._strategy = None
self._next_period = None
self.set_strategy('none')
@property
def value(self):
return self._last_update.value
@property
def status(self):
return self._last_update.status
@property
def strategy(self):
return SampleStrategy.SAMPLING_LOOKUP[self._strategy.get_sampling()]
def get_value(self):
# XXX Check whether this also triggers a sensor update a la strategy
return self._sensor.value()
def _set_value(self, value, status=Sensor.NOMINAL):
self._sensor.set_value(value, status, self._clock.time())
def _update_value(self, timestamp, status_str, value_str):
update_seconds = self._clock.time()
value = self._sensor.parse_value(value_str)
self._last_update = SensorUpdate(update_seconds, timestamp, status_str,
value)
for listener in set(self._listeners):
listener(update_seconds, timestamp, status_str, value_str)
def set_strategy(self, strategy, params=None):
"""Set sensor strategy."""
def inform_callback(sensor_name, timestamp_str, status_str, value_str):
"""Inform callback for sensor strategy."""
self._update_value(float(timestamp_str), status_str, value_str)
print sensor_name, timestamp_str, status_str, value_str
if self._strategy:
self._strategy.detach()
params = normalize_strategy_parameters(params)
self._strategy = SampleStrategy.get_strategy(strategy, inform_callback,
self._sensor, *params)
self._strategy.attach()
self._next_period = self._strategy.periodic(self._clock.time())
def update(self, timestamp):
while self._next_period and timestamp >= self._next_period:
self._next_period = self._strategy.periodic(self._next_period)
def register_listener(self, listener, min_wait=-1.0):
"""Add a callback function that is called when sensor value is updated.
Parameters
----------
listener : function
Callback signature: listener(update_seconds, value_seconds, status, value)
min_wait : float, optional
Minimum waiting period before listener can be called again, used
to limit the callback rate (zero or negative for no rate limit)
*This is ignored* as the same effect can be achieved with an
event-rate strategy on the sensor.
"""
self._listeners.add(listener)
def unregister_listener(self, listener):
"""Remove a listener callback added with register_listener().
Parameters
----------
listener : function
Reference to the callback function that should be removed
"""
self._listeners.discard(listener)
class MyServer(DeviceServer):
VERSION_INFO = ("dummy-server", 1, 0)
BUILD_INFO = ("hipsr-dummy-server", 0, 1, "")
FRUIT = [
"apple", "banana", "pear", "kiwi",
]
BANDS = [
"autolux", "nirvana", "acdc", "tool",
]
def setup_sensors(self):
"""Setup some server sensors."""
self._add_result = Sensor(Sensor.FLOAT, "add.result",
"Last ?add result.", "", [-10000, 10000])
self._time_result = Sensor(Sensor.TIMESTAMP, "time.result",
"Last ?time result.", "")
self._eval_result = Sensor(Sensor.STRING, "eval.result",
"Last ?eval result.", "")
self._fruit_result = Sensor(Sensor.DISCRETE, "fruit.result",
"Last ?pick-fruit result.", "", self.FRUIT)
self._band_result = Sensor(Sensor.DISCRETE, "band.result",
"Last ?pick-band result.", "", self.BAND)
self.add_sensor(self._add_result)
self.add_sensor(self._time_result)
self.add_sensor(self._eval_result)
self.add_sensor(self._fruit_result)
self.add_sensor(self._band_result)
@request(Float(), Float())
@return_reply(Float())
def request_add(self, sock, x, y):
"""Add two numbers"""
r = x + y
self._add_result.set_value(r)
return ("ok", r)
@request()
@return_reply(Timestamp())
def request_time(self, sock):
"""Return the current time in ms since the Unix Epoch."""
r = time.time()
self._time_result.set_value(r)
return ("ok", r)
@request(Str())
@return_reply(Str())
def request_eval(self, sock, expression):
"""Evaluate a Python expression."""
r = str(eval(expression))
self._eval_result.set_value(r)
return ("ok", r)
@request()
@return_reply(Discrete(FRUIT))
def request_pick_fruit(self, sock):
"""Pick a random fruit."""
r = random.choice(self.FRUIT + [None])
if r is None:
return ("fail", "No fruit.")
self._fruit_result.set_value(r)
return ("ok", r)
@request()
@return_reply(Discrete(BAND))
def request_pick_band(self, sock):
"""Pick a random fruit."""
r = random.choice(self.BAND + [None])
if r is None:
return ("fail", "No band.")
self._fruit_result.set_value(r)
return ("ok", r)